89893

Appears in sequences

• Number of ways to tile a square of side 2n by dominoes (rectangles of size 2 X 1 or 1 X 2) is 2^n * a(n)^2 (see A004003).at n=5A065072
• Order of all-2s configuration on the 2n X 2n sandpile grid graph.at n=5A256043
• Triangle read by rows: order of all-2s configuration on the n X k sandpile grid graph.at n=54A256045
• Main diagonal of A256045: order of all-2s configuration on the n X n sandpile grid graph.at n=10A256046
• a(n) is the denominator corresponding to A376606(n).at n=9A376607